In a statement, Health Authority chiefs said: “All babies in the unit have been tested and the results indicate that no baby has tested positive for pseudomonas.

“Babies will continue to be screened on an ongoing basis. Parents of babies in the unit have been informed of the position.”

No new cases of pseudomonas have been reported at either hospital but staff at both units have been told to avoid using tap water with babies while tests on water outlets and necessary refits are carried out.

The Health Service update added: “According to the latest figures, there are no new cases of pseudomonas infection at the Royal Jubilee Maternity Hospital’s (RJMH) neonatal unit, so the overall total who have been infected in this outbreak remains at seven.

“It is not causing active infection in these babies. All necessary precautions are being taken to avoid the spread of infection.”